Customise is the workspace briefing. Use it for things that should be true in every chat: your name for the product, how you like drafts, tools Kaer may call.

Apps, Sources, and API live here. Sources is where you add your own files.
Information
Open Customise from the app rail.
- How you want writing to sound
- Tools that should always be available
- Defaults that would otherwise be repeated in every prompt
Keep it short. A page of rules is worse than five lines people will actually follow.
Warning
Secrets, API keys, and one-off task detail do not belong here. Keys belong nowhere in the user guide and nowhere in Customise. One-off detail belongs in the Chat thread.